package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional  //涉及两条sql ：事务管理
    public void saveWithFlavor(DishDTO dishDTO) {
        //新增菜品
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.insert(dish);  //keyProperty="id"  插入完sql语句返回主属性存入id属性中

        Long dishId=dish.getId();  //新增口味的时候要知道id
        //新增口味
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors !=null && !flavors.isEmpty()){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insert(flavors);
        }


    }

    /**
     * 分页查询
     * @param dishPageQueryDTO
     * @return {@code PageResult }
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);  //查询返回的结果是要是Page类型
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for(Long id:ids){
            Dish dish=dishMapper.getById(id);
            if (dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据   -这里可以优化：通过动态sql in()
        for(Long id:ids){
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteById(id);
        }

    }

    /**
     * 修改菜品查询回显
     * @param id
     * @return {@code DishVO }
     */
    @Override
    public DishVO getById(Long id) {

        Dish dish=dishMapper.getById(id);
        List<DishFlavor> dishFlavors=dishFlavorMapper.getById(id);

        DishVO  dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品表基本数据
        dishMapper.update(dish);

        //删除口味表
        dishFlavorMapper.deleteById(dish.getId());
        //插入口味表
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors!=null && !flavors.isEmpty()){
            flavors.forEach(dishFlavor -> {
               dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insert(flavors);
        }

    }

    /**
     * 根据菜品id查询菜品
     * @param categoryId
     * @return {@code List<Dish> }
     */
    @Override
    public List<Dish> list(Long categoryId) {

        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish=Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        //如果是停售操作，还要把相关套餐也停掉
        if (status==StatusConstant.DISABLE){
            List<Long> dishIds= new ArrayList<>();
            dishIds.add(id);
            List<Long> setmealIds=setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            for (Long setmealId:setmealIds){
                //停售操作，停售相关套餐
                Setmeal setmeal = Setmeal.builder()
                        .id(setmealId)
                        .status(StatusConstant.DISABLE)
                        .build();
                setmealMapper.update(setmeal);
            }
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味

            List<DishFlavor> flavors = dishFlavorMapper.getById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
